import React, { Component } from 'react'
import { Flex, WingBlank, WhiteSpace, Toast } from 'antd-mobile'

import { Link } from 'react-router-dom'

import NavHeader from '../../components/NavHeader'
import {API} from '../../utils/api'

import styles from './index.module.css'
import { withFormik, Form, ErrorMessage, Field } from 'formik'
import * as Yup from 'yup'

// 验证规则：
const REG_UNAME = /^[a-zA-Z_\d]{5,8}$/
const REG_PWD = /^[a-zA-Z_\d]{5,12}$/

class Login extends Component {
  render() {
    return (
      <div className={styles.root}>
        {/* 顶部导航 */}
        <NavHeader className={styles.navHeader}>账号登录</NavHeader>
        <WhiteSpace size="xl" />

        {/* 登录表单 */}
        <WingBlank>
          <Form>
            <div className={styles.formItem}>
              <Field className={styles.input}  name="username" placeholder="请输入账号"/>
            </div>
            <ErrorMessage
              className={styles.error}
              name="username"
              component="div"
            />
            
            <div className={styles.formItem}>
              <Field
                className={styles.input}
                name="password"
                type="password"
                placeholder="请输入密码"
              />
            </div>
            <ErrorMessage
              className={styles.error}
              name="password"
              component="div"
            />

            <div className={styles.formSubmit}>
              <button className={styles.submit} type="submit">
                登 录
              </button>
            </div>
          </Form>
          <Flex className={styles.backHome}>
            <Flex.Item>
              <Link to="/registe">还没有账号，去注册~</Link>
            </Flex.Item>
          </Flex>
        </WingBlank>
      </div>
    )
  }
}

const FormikLogin = withFormik({
  mapPropsToValues: () => ({ username: '', password: '' }),
  handleSubmit: async (values, { props }) => {
    const {username, password} = values

    const {data} = await API.post('/user/login', {
      username,
      password
    })

    if(data.status !== 200) {
      Toast.fail(data.description, 2, null, false)
      return 
    }

    localStorage.setItem('hkzf_token', data.body.token)

    if (!props.location.state) {
      props.history.go(-1)
    } else {
      props.history.replace(props.location.state.from)
    }

  },
  validationSchema: Yup.object().shape({
    username: Yup.string()
      .required('账号为必填项')
      .matches(REG_UNAME, '长度为5到8位，只能出现数字、字母、下划线'),
    password: Yup.string()
      .required('密码为必填项')
      .matches(REG_PWD, '长度为5到12位，只能出现数字、字母、下划线')
  })
})(Login)

export default FormikLogin
